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MITRA Forum Question Details

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  • PROBLEMS WITH ALKYDS (PAINT MAKING, MEDIUM MAKING)ApproveRejectUn-ApproveSubscribeUn-Unsubscribe
    Question asked 2020-07-15 05:15:01 ... Most recent comment 2020-07-17 20:16:38
    Alkyd
    Question

    699/5000

    Hello Mitra, I have been experimenting with  AM (Kremer) alkyd resin not only to make paint but to make a medium and putty.

    -Using the raw resin the paint becomes unusable in a matter of minutes.

    Only when the resin is diluted in approximately 20% resin 80% normal linseed oil does the paint have desirable properties.

    The same thing happens when I make a medium that becomes sticky in no time if I don't add oil.

    My questions are:

    1-Is it normal for this to happen?

    2-When manufacturers name a line of paints as alkyd, is it possible that they only contain a very small fraction of resin?

    I love the work that you are doing.

    Thank you.

Answers and Comments

  • EditDeleteModerator Answer

    According to Kremer’s data sheet, the AM should have 62% oil which should be enough to prevent the almost immediate setting that you describe. Perhaps the problem is that the solvent evaporates too quickly for you, leaving a too dense solution. Have you tried adding a slower evaporating solvent?  Perhaps others can comment.

    Brian Baade
    2020-07-15 16:54:29
  • EditDeleteModerator Answer

    After looking up the evaporation of the solvent D40, this appears to be the problem. 90% of D40 will have evaporated after a few seconds.

    Brian Baade
    2020-07-15 17:02:14
  • EditDeleteModerator Answer

    ​The 1st generation of alkyd artists' colors were described as rubbery. Current formulas include significantly more oil than when the product was first introduced, and workability is much improved. 

    I wonder if your results would be better if the pigment were introduced as a wet paste with solvent and oil first, and alkyd subsequently added to the paste, rather than starting with the alkyd medium and adding oil later, after the paint body has already become too stiff.

    Matthew Kinsey, Utrecht Art Supplies
    2020-07-15 18:27:45
  • ApproveRejectUn-ApproveUser Comment

    I think you're right, the problem is the solvent. I am doing tests with "shelsol t" but the paint turns very liquid. I have tried thickening with bentonite and it does not work. I will try tixogel in the following tests.  Many thanks!​

    2020-07-16 17:19:50
  • EditDeleteModerator Answer

    It would seem that one could simply add about 35% of a slow evaporating MS to the paint as you are mixing it. Continue mixing until the D40 evaporates and you should have a serviceable paint. The only issue would be if there is an azeotrope relationship between the D40 and your added slower evaporating MS.

    See https://en.wikipedia.org/wiki/Azeotrope

    Brian Baade
    2020-07-17 20:16:38

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